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What’s Your Sun Number, Bay Area?: Sun Number Simplifies Solar in the SF Bay Area

DOE-Funded Company Launches One-Click Service for Determining
If a Home or Commercial Building Can Benefit from Solar Energy


With only a street address and a mouse click, property owners and solar companies in the San Francisco Bay Area can now instantly find the solar energy potential of a home or commercial property at The service from Sun Number, which is free to consumers, has just been made available for San Francisco, San Jose, Oakland and many other cities and towns in the Bay Area. Developed with funding from the U.S. Department of Energy’s SunShot initiative, this first-of-its-kind service makes it possible for anyone in this region to obtain an immediate assessment of how suitable a building is for solar. The assessment provides a Sun Number Score between 1 and 100 as well as other easy-to-understand information that explains how much a building can benefit from installation of solar on the rooftop.

Sun Number for Property Owners
For homeowners and other property owners, this website provides a free, instantaneous analysis that allows property owners to turn their curiosity about solar energy into practical information about how much money they can save in utility costs by installing solar panels. The site also offers to connect the property owner with a local solar provider that can discuss solar solutions in more detail with no obligation to buy. The service was developed with funding from a DOE program designed to educate the public about solar energy and broaden adoption of the technology nationwide.

“If you’ve ever wondered how much you could save by having solar on the roof of your home or commercial building, now you can have an instant answer to that question. Just type in the address at and it gives you a Sun Number Score that explains how solar-friendly your building is. The information it provides also includes an estimate of how much money you can save on your utilities per year, which will help you understand how quickly an investment in solar will pay for itself,” said David Herrmann, co-founder of Sun Number. “People are often shocked to see that their Sun Number Score is high even though they live in a region without a lot of blue-sky days or live in a neighborhood with a lot of shade trees. People in the SF Bay Area often discount how much they can benefit from solar, but this will turn that conventional wisdom upside down. The Bay Area has great conditions for solar energy, and now it’s incredibly easy to find out just how solar-friendly your property is.”

“Luminalt is thrilled to offer Sun Number on our website and empower consumers seeking to educate themselves about the suitability of solar for their home,” said Jeanine Cotter of Luminalt, a San Francisco-based solar energy solutions provider to the entire Bay Area.

Sun Number for Solar Companies
For solar companies in the Bay Area, Sun Number provides an instant, accurate analysis of a property’s solar potential that can be accessed in real time during the very first conversation with a customer. This is dramatically faster and less expensive than the traditional method, which required solar companies to wait for good weather and then send a truck to the property for an employee to conduct a rooftop assessment. That process not only ties up the employee for half a day of on-site work but often slows down the consultation process with the customer by several days.

Herrmann added, “Using Sun Number can save a solar company hundreds or even thousands of dollars of soft costs on a project, and it can shave days or weeks off the sales process. The information we provide with just an address and a click is highly accurate thanks to high-resolution aerial data, mapping software and advanced algorithms that take into account factors such as foliage and shade. By providing an accurate solar analysis that eliminates the need to send a truck to the property, Sun Number accelerates the sales process and dramatically increases each project’s profit margin. It is a must-have tool for solar companies.”

To get an instant analysis of your property or your customer’s property, visit

About Sun Number
Sun Number, LLC is accelerating the adoption of solar energy technology across the United States by providing solar providers and property owners with instant assessments of the solar potential of homes and buildings. With a single click, Sun Number provides an analysis of how solar-friendly a home or building is, using a methodology that factors in everything ranging from sun exposure to regional climate to foliage. This produces a Sun Number Score that provides information that solar companies can use to shorten the sales cycle and that property owners can use to understand how much they can benefit from solar power. Sun Number, LLC was founded in 2012 with a SunShot Initiative award from the U.S. Department of Energy, which supports emerging companies broadening adoption of solar energy technology. For more information about Sun Number, visit



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